docs: def unsub(feednames, delete, dontask):
      """
      Unsubscribe from the specified feed(s).
      """
  
      ecode = 0
      try:
          for feed in feednames:
              rc, msg = anchore_feeds.unsubscribe_anchore_feed(feed)
              if not rc:
                  ecode = 1
                  anchore_print_err(msg)
              else:
                  anchore_print(msg)
                  if delete:
                      dodelete = False
                      if dontask:
                          dodelete = True
                      else:
                          try:
                              answer = raw_input("Really delete feed data ("+str(feed)+"'? (y/N)")
                          except:
                              answer = "n"
                          if 'y' == answer.lower():
                              dodelete = True
                          else:
                              anchore_print(str(feed) + ": skipping delete.")
  
                      if dodelete:
                          anchore_print(str(feed) + ": deleting feed.")
                          rc = anchore_feeds.delete_anchore_feed(feed)
  
      except Exception as err:
          anchore_print_err('operation failed')
          ecode = 1
  
      sys.exit(ecode)